Math problem of senior two 20 12 A problem in the final examination paper of senior two next semester in Yuhang District, Hangzhou.
① Right-angled trapezoid:
2t = 4，t = 2
Or t = 4.
② parallelogram:
∣2t - 4∣=∣t - 4∣,t = 8/3
③ Diamond:: does not exist.
t = 8/3,∣AP∣= √[(4 - 16/3)？ + 4? ] ≠ 5